are usually between 20 and 30 euro (autographs same price). It depends on how well known the star is. Ian Somerhalder at BloodyCon last year was 50 euro. Some of the minor stars of Harry Potter were 15 euro. So if you go for 25 euro per photo, you will be fine.

At RingCon they usually have the Kiwis (the stars from NZ, Craig Parker, Mark Ferguson, Lori Dungey and who ever is happening to come from NZ) do a group photo. But those guys are more for fun at RingCon than for serious business, they also only ask 20 euro. I think they might do group photo sessions for some of the dwarves. Those might be more expensive.

(oh, you have to pay it in cash! So bring enough money with you. There is an ATM at the hotel, but a few years back it was empty on Sunday.)